noun
armchair intellectual; pale-faced intellectual
A somewhat literary or critical term for an intellectual who lacks practical experience, often with a connotation of being bookish, physically weak, or out of touch with reality. The 青白き ('pale') evokes a studious, indoor image.
彼は青白きインテリで、現場のことは何も知らない。
He's an armchair intellectual who knows nothing about the actual work site.
青白
You can't solve real-world problems just with the arguments of pale-faced intellectuals.